The (SMD) Surface Mount with Drain style drip trays are designed to mount to the top of any suitable surface with a drain hole drilled through.Trays are secured to surface using supplied hardware. Drip Trays are made of 18 ga. Stainless Steel in #8 mirror finish. The corners and seams are welded and ground to a polished (mirror) high finish. All exposed edges are deburred smooth for safety and appearances. Each tray is available with a standard 20 ga. louvered screen. Drain tubes are 5/8-18 x 3" brass and secured to welded female drain fitting.